Meh, it wasn't developed by Croteam so I wouldn't get too excited about it. There are a few more exploits on Mental, one of which states "he" when describing Mental. It's located on the back of the Serious Sam HD: The Second Encounter case in the description. I'm too lazy to go find it right this moment though.

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My name is Mongo, and I like Gnaars. And Cookies. Mmmm... Cookies!